1  –  DATA

 Specifies the default packet size for X25 virtual circuits. This
 value must be at least 5 bytes less than the MAXIMUM BLOCK value you
 specify in the SET LINE command and must be a power of 2. Specify a
 value in the range 16 to 4096 bytes.

 By default packet size takes the network value specified by the
 PROFILE parameter.

2  –  WINDOW count

 Specifies the default window size for X25 virtual circuits, that is,
 the maximum number of packets for which outstanding acknowledgments
 are allowed. Specify a value in the range 1 to 127.

 By default, window size takes the network value specified by the
 PROFILE parameter.